如题，iOS端小程序原生页请求时，UA里没有miniprogram，拿了两个iPhone测试都没有

// iPhone 11
Mozilla/5.0 (iPhone; CPU iPhone OS 15_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 MicroMessenger/8.0.18(0x18001224) NetType/WIFI Language/zh_CN

// iPhone 8 Plus
Mozilla/5.0 (iPhone; CPU iPhone OS 14_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 MicroMessenger/8.0.17(0x1800112d) NetType/WIFI Language/zh_CN

但打开内嵌 webview，webview页面的请求UA是有miniprogram的

// iPhone 11
Mozilla/5.0 (iPhone; CPU iPhone OS 15_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 MicroMessenger/8.0.18(0x18001224) NetType/WIFI Language/zh_CN miniProgram/wxxxxxxxxxxxxxxxxxxxxx

// iPhone 8 Plus
Mozilla/5.0 (iPhone; CPU iPhone OS 14_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 MicroMessenger/8.0.17(0x1800112d) NetType/WIFI Language/zh_CN miniProgram/wxxxxxxxxxxxxxxx

安卓正常，但UA看起来也像是改过，变成了 MiniProgramEnv/android

Mozilla/5.0 (Linux; Android 11; SM-G9750 Build/RP1A.200720.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/86.0.4240.99 XWEB/3185 MMWEBSDK/20220105 Mobile Safari/537.36 MMWEBID/815 MicroMessenger/8.0.19.2080(0x28001337) Process/appbrand2 WeChat/arm64 Weixin NetType/WIFI Language/zh_CN ABI/arm64 MiniProgramEnv/android

请问有什么修改UA的方法吗，或者这是一个bug？